Marine block



FIG. 1 is a perspective view from the front showing a marine block embodying the elements of my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a view similar to FIG. 2 of a modified form of the block; and

FIG. 7 is a view similar to FIG. 3 thereof.

The backs and sides of the blocks not shown are substantially the same as the fronts and sides shown. 

The ornamental design of a marine block, substantially as shown and described. 